CN107055822B - Biological dispersant for circulating cooling water and preparation method thereof - Google Patents
Biological dispersant for circulating cooling water and preparation method thereof Download PDFInfo
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- CN107055822B CN107055822B CN201710467862.9A CN201710467862A CN107055822B CN 107055822 B CN107055822 B CN 107055822B CN 201710467862 A CN201710467862 A CN 201710467862A CN 107055822 B CN107055822 B CN 107055822B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/20—Prevention of biofouling
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/04—Surfactants, used as part of a formulation or alone
Abstract
The invention discloses a biological dispersant for circulating cooling water, which comprises the following raw material components in parts by weight: 30-60 parts of sodium styrene sulfonate-acryloyl morpholine polymer and/or allyl alcohol-acryloyl morpholine polymer, 10-30 parts of polyaspartic acid and 1-10 parts of polyoxyethylene ether surfactant. The obtained biological dispersing agent for circulating cooling water has the advantages that the penetrating capacity of organic matters and the dispersing capacity of inorganic dirt and organic matter precipitates are obviously enhanced, the penetrability of bactericides to biological slime can be improved, the sterilization effect is improved, and the removal effect of pipe wall microorganisms and biological slime is further optimized. In addition, the biological dispersant of the invention has mutual miscibility and solubility with other water treatment agents such as scale and corrosion inhibitors used in the circulating cooling water, and can help the other water treatment agents to play roles. The biological dispersant disclosed by the invention is simple and convenient in preparation method, safe and environment-friendly, biodegradable and wide in application prospect.
Description
Technical Field
The invention relates to the technical field of water treatment agents, in particular to a biological dispersant for circulating cooling water, and also relates to a preparation method of the biological dispersant.
Background
The industrial circulating cooling water provides sufficient nutrients for the propagation of microorganisms due to the existence of a large amount of organic and inorganic compounds in the water, and biological slime is easy to grow in the environment with proper water temperature and air. A large amount of biological slime in a circulating cooling water system not only causes difficulty in maintenance and management of system equipment, but also has the biggest problems of reducing the heat transfer effect of the system, causing direct or indirect damage to the system equipment, reducing the service life of the equipment and bringing about economic loss and potential safety hazards in production. The biological slime is mainly composed of microbial thalli and polysaccharide and protein sticky substances which are bonded together, and has strong adhesive force and cohesiveness, so that the control and the cleaning of the biological slime are more complicated and difficult to treat in an industrial circulating cooling water system. At present, oxidation type bactericides and non-oxidation type bactericides are widely used for controlling biological slime, such as chlorine gas, sodium hypochlorite, chlorine dioxide, quaternary ammonium salt compounds, formaldehyde and the like, but even if the concentration of the added bactericides is proper, a plurality of factors still exist to influence the function of the bactericides, such as reducing substances, heavy metals, sulfate ions, biological enzymes and the like in a water body can cause the invalidation of the bactericides, and a plurality of bactericides are effective in controlling bacteria in suspension liquid, but are ineffective to the bacteria in the biological slime, and the function of the bactericides is limited because the bactericides are difficult to penetrate through the biological slime. In response to the above, technicians improve the use effect of the bactericide by adding the biological dispersant, and enhance the permeation of the bactericide into the biological membrane by utilizing the dispersion and permeation effects of the biological dispersant so as to enhance the stripping effect on the biological slime. The prior biological dispersant is generally composed of surfactants which have neutralized charged colloidal particles and can redissolve or suspend the particles, but the surfactants can be associated with anionic scale and corrosion inhibitors commonly used in circulating cooling water systems, so that the action of the two agents is lost or even lost, and the normal operation of the circulating cooling water is influenced.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the biological dispersant for the circulating cooling water, which not only has extremely strong penetrating power and dispersing power and can promote the remarkable improvement of the effect of the bactericide, but also can be mixed and coexisted with other medicaments such as scale and corrosion inhibitors in the circulating cooling water to ensure the normal operation of the circulating cooling water.
In order to achieve the aim, the biological dispersant for circulating cooling water provided by the invention comprises the following raw materials in parts by weight: 30-60 parts of sodium styrene sulfonate-acryloyl morpholine polymer and/or allyl alcohol-acryloyl morpholine polymer, 10-30 parts of polyaspartic acid and 1-10 parts of polyoxyethylene ether surfactant.
The biological dispersant of the invention takes the sodium styrene sulfonate-acryloyl morpholine polymer and/or the allyl alcohol-acryloyl morpholine polymer and the polyaspartic acid as main agents, the sodium styrene sulfonate-acryloyl morpholine polymer and the allyl alcohol-acryloyl morpholine polymer are water-soluble scale inhibition dispersants, and have good scale inhibition dispersion effect due to high surface activity and good wetting permeability, and also contain morpholine groups with tertiary amine structures, so that the biological dispersant has good broad-spectrum bactericidal effect, acid resistance, alkali resistance, hard water resistance, insensitivity to high-concentration electrolytes and other excellent performances; polyaspartic acid is a water-soluble polymer of amino acids, and has high chemical stability, biological activity, chemical activity, dispersibility, hydrophilicity, hygroscopicity, biodegradability and other excellent performances because the molecules of polyaspartic acid contain abundant active groups such as amido bonds, carboxyl and the like; through the combination of the sodium styrene sulfonate-acryloyl morpholine polymer and/or the allyl alcohol-acryloyl morpholine polymer and the polyaspartic acid, the penetrating power of organic matters and the dispersing power of inorganic dirt and organic matter precipitation are obviously enhanced, and under the synergistic effect of the two substances, the penetrability of the bactericide to biological slime can be improved, so that microbial cells in the slime are more easily contacted with the bactericide, the sterilization effect is improved, and then microorganisms and biological slime are removed from the surface of the pipe wall. And the polyoxyethylene ether surfactant is added, and the characteristics of the nonionic surfactant are utilized, so that the sodium styrene sulfonate-acryloyl morpholine polymer and/or the allyl alcohol-acryloyl morpholine polymer are compounded with the polyaspartic acid through emulsification and osmosis to obtain synergistic interaction, the biological dispersing agent obtained is obviously enhanced in the aspects of osmosis and dispersion on biological slime and inorganic dirt, and can be better matched with a bactericide for use, and the slime stripping effect is fully exerted. The biological dispersant disclosed by the invention has excellent permeation and dispersion effects, can improve the effect of a bactericide, can be mutually mixed and dissolved with other water treatment medicaments such as scale and corrosion inhibitors used in circulating cooling water due to the nonionic characteristic, and can help the exertion of the effects of other water treatment medicaments such as scale and corrosion inhibitors.
As a limitation to the above technical solution, the polyoxyethylene ether surfactant includes at least one of n-octanol polyoxyethylene ether, isooctanol polyoxyethylene ether, or fatty acid methyl ester polyoxyethylene ether.
As a limitation to the above technical solution, the molecular weight of the polyaspartic acid is 3000-5000.
As a limitation on the technical scheme, the biological dispersant comprises the following raw materials in parts by weight: 40-60 parts of a mixture of styrene sodium sulfonate-acryloyl morpholine polymer and allyl alcohol-acryloyl morpholine polymer according to the weight ratio of 7:3, 20-30 parts of polyaspartic acid with the molecular weight of 3000-5000 and 3-8 parts of a mixture of n-octanol polyoxyethylene ether and isooctanol polyoxyethylene ether according to the weight ratio of 1: 1.
Further limit the molecular weight of the polyoxyethylene ether surfactant and the polyaspartic acid, and the optimized formula of the raw material components so as to enhance the penetration and dispersion capability of the biological dispersant and the synergistic function of the biological dispersant.
As a limitation to the above technical solution, the bio-dispersant further comprises raw material components: 1-10 parts of acrylic acid-2-methyl-2-acrylamide propyl sulfonic acid copolymer.
As a limitation to the above technical solution, the bio-dispersant further comprises raw material components: 1-10 parts of sodium dodecyl sulfate.
The acrylic acid-2-methyl-2-acrylamide propyl sulfonic acid copolymer has a molecular structure containing carboxyl with strong dispersibility and strong polar sulfonic acid group, and has excellent dispersibility.
The sodium dodecyl sulfate has good emulsifying, foaming, penetrating, decontaminating and dispersing performances.
In the biological dispersant, acrylic acid-2-methyl-2-acrylamide propyl sulfonic acid copolymer and sodium dodecyl sulfate which are raw materials are further added, so that the biological permeation, dispersion and sterilization effects are obviously enhanced.
Meanwhile, the invention also provides a preparation method of the biological dispersant for circulating cooling water, which comprises the following steps:
a. adding polyoxyethylene ether surfactant into polyaspartic acid under stirring, and stirring at room temperature for 30-60min to obtain solution A;
b. adding deionized water into the sodium styrene sulfonate-acryloyl morpholine polymer and/or the allyl alcohol-acryloyl morpholine polymer, stirring for 30-60min at room temperature, adjusting the pH value to 9.0 +/-0.5, and stirring uniformly to obtain a solution B;
c. and taking the solution A, adding the solution B under the stirring state, adjusting the pH value to 12 +/-0.5, and stirring at room temperature for 1-2h to obtain the biological dispersant for the circulating cooling water.
The preparation of the biological dispersant of the invention ensures that functional groups among the raw material components can be fully activated and crosslinked by limiting the pretreatment mode, pH regulation and mixing sequence of the raw material components to generate a synergistic effect, ensure the stability and excellent performance of the biological dispersant, enhance the synergistic effect on a bactericide, and enhance the stability and promotion of other water treatment agents used with circulating cooling water.
As a limitation to the technical scheme, the stirring speed in the steps a-c is 30-60 r/min.
Further inject the stirring speed, the control stirring is difficult too fast, avoids mixing process to take place the bubble phenomenon.
In the step b, deionized water is added into the sodium styrene sulfonate-acryloyl morpholine polymer and/or the allyl alcohol-acryloyl morpholine polymer and is uniformly stirred, then acrylic acid-2-methyl-2-acrylamide propyl sulfonic acid copolymer and/or sodium dodecyl sulfate is added, and the mixture is stirred at room temperature and the pH value is adjusted.
As a limitation to the technical scheme, the polyaspartic acid is prepared by the following steps:
(1) synthesis of polysuccinimide: carrying out thermal condensation polymerization reaction on raw material L-aspartic acid under the action of catalyst phosphoric acid to prepare polysuccinimide; the reaction temperature is 180-200 ℃, and the reaction time is 1-2 h;
(2) hydrolyzed polysuccinimide: adding water into a reaction kettle, starting stirring, adding polysuccinimide, slowly adding a sodium hydroxide solution, heating for hydrolysis reaction to obtain a polyaspartic acid solution; the hydrolysis temperature is 65 ℃, and the hydrolysis reaction time is 0.5-1 h.
(3) Adjusting the pH value: adjusting the pH value of the polyaspartic acid solution to 9.0-10.0 to obtain polyaspartic acid with the molecular weight of 3000-5000.
Further limiting the preparation method of polyaspartic acid with the molecular weight of 3000-5000-.
In conclusion, the biological dispersant for circulating cooling water obtained by adopting the technical scheme of the invention takes the sodium styrene sulfonate-acryloyl morpholine polymer and/or the allyl alcohol-acryloyl morpholine polymer and the polyaspartic acid as main agents, and the polyoxyethylene ether surfactant as an auxiliary agent, so that the penetration capacity of the biological dispersant on organic matters and the dispersion capacity of inorganic dirt and organic matter precipitates are remarkably enhanced, the penetration of the biological dispersant on biological slime can be improved, the sterilization effect is improved, and the effect of removing microorganisms, biological slime and inorganic dirt from the surface of the pipe wall is further optimized. In addition, the biological dispersant of the invention has mutual miscibility and solubility with other water treatment agents such as scale and corrosion inhibitors used in the circulating cooling water, and can also help the other water treatment agents to play roles. The biological dispersant disclosed by the invention is simple and convenient in preparation method, safe and environment-friendly, biodegradable and wide in application prospect.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The embodiment relates to a biological dispersant for circulating cooling water and preparation thereof.
The raw material formula of the biological dispersant for circulating cooling water is shown in the following table:
the preparation method comprises the following steps:
a. adding polyaspartic acid with the molecular weight of 3000-5000-;
b. placing the sodium styrene sulfonate-acryloyl morpholine polymer and/or the allyl alcohol-acryloyl morpholine polymer into another reaction container, adding deionized water, wherein the water addition amount can be adjusted according to actual conditions, the viscosity of the solution in the stirring process needs to be ensured to be proper, and the solid content of the prepared biological dispersant is more than or equal to 40%; stirring at room temperature of 25 deg.C for 30-60min, adjusting pH to about 9.0 (pH can be adjusted with dilute sodium hydroxide solution), and stirring to obtain solution B;
c. and adding the solution A into the solution B under the stirring state, adding a dilute sodium hydroxide solution to adjust the pH to about 12, continuously stirring for 1-2h at the room temperature of 25 ℃, and uniformly mixing to obtain the biological dispersant for the circulating cooling water.
In the preparation process, in order to avoid bubbles generated during the mixing of the raw material components, the stirring speed of each stirring process can be controlled to be 30-60 r/min; when the raw material components comprise acrylic acid-2-methyl-2-acrylamide propyl sulfonic acid copolymer and/or sodium dodecyl sulfate, adding deionized water into the styrene sodium sulfonate-acryloyl morpholine polymer and/or the allyl alcohol-acryloyl morpholine polymer in the step b, uniformly stirring, sequentially adding acrylic acid-2-methyl-2-acrylamide propyl sulfonic acid copolymer and/or sodium dodecyl sulfate, stirring at room temperature, and adjusting the pH value.
The obtained biological dispersant is colorless or light yellow viscous transparent liquid; the physicochemical characteristics are as follows: the solid content is more than or equal to 40 percent, the pH value is 12 plus or minus 0.5, and the specific gravity is 1.07-1.10.
Among the raw material components, polyaspartic acid with molecular weight of 3000-:
(1) synthesis of polysuccinimide: carrying out thermal condensation polymerization reaction on the raw material L-aspartic acid at the reaction temperature of 180 ℃ and 200 ℃ under the action of a catalyst phosphoric acid for 1-2h to prepare polysuccinimide;
(2) hydrolyzed polysuccinimide: adding deionized water into the reaction kettle, wherein the water adding amount can be adjusted according to actual needs; starting stirring, adding polysuccinimide, slowly adding sodium hydroxide solution, heating for hydrolysis reaction, and hydrolyzing at 65 ℃ for 0.5-1h to obtain polyaspartic acid solution;
(3) adjusting the pH value: adjusting the pH value of the polyaspartic acid solution to 9.0-10.0 to obtain polyaspartic acid with the molecular weight of 3000-5000 and obtain polyaspartic acid with the molecular weight of 3000-5000.
Comparative example
The present example relates to a group of bio-dispersants different from the bio-dispersant for circulating cooling water of the present invention, and the raw material formula thereof is shown in the following table:
the obtained comparative example dispersant is colorless or light yellow viscous transparent liquid in appearance; the physicochemical characteristic is that the solid content is more than or equal to 40 percent.
Example two
This example relates to the comparison of the effect of the treatment of circulating cooling water between the biological dispersants of the present invention and the biological dispersants of the comparative examples.
The main water quality indexes of a circulating cooling water system of a certain coking plant are as follows:
| index of water quality | Water supplement | Circulating water |
| Calcium hardness (as CaCO3))，mg/L | 216.20 | 463.09 |
| Total hardness (as CaCO3), mg/L | 324.29 | 730.74 |
| Total alkalinity (as CaCO3), mg/L | 163.01 | 364.16 |
| Chloride ion mg/L | 39.70 | 97.27 |
| pH value | 7.82 | 8.84 |
| Turbidity NTU | 3.2 | 15.0 |
| COD | 14.7 | 38.0 |
The biological dispersant of the first embodiment and the biological dispersant of the comparative example are used to carry out a water quality treatment simulation experiment together with the bactericide and the scale and corrosion inhibitor respectively.
In the following simulation experiments, the laboratory evaluation method of the biological slime stripping performance adopts an extracellular polymer method, wherein the main organic components of the extracellular polymer are saccharides, nucleic acid and protein, the extracellular polymer has the functions of changing the surface characteristics of bacterial flocs and the physical characteristics of granular sludge and promoting the intercellular aggregation and the structure stability, after a biological dispersant acts on the biological slime, the extracellular polymer is destroyed, the components such as polysaccharide, nucleic acid and the like are dispersed in circulating cooling water, and the microorganisms in the biological slime are easily killed after losing a protective layer; therefore, the slime removing effect of the biological dispersant can be evaluated by analyzing the content of polysaccharide and nucleic acid, and after the treatment of adding the medicament, the higher the content of polysaccharide and nucleic acid is, the better the biological slime removing performance of the medicament is.
The polysaccharide content is measured by adopting an anthrone sulfuric acid method, and the method comprises the following steps: placing the solution to be measured in a test tube, adding anthrone reagent, boiling in boiling water bath for 10min, cooling, measuring absorbance at 620nm wavelength, and calculating polysaccharide content of the solution to be measured according to the measured standard curve.
The determination of the content of the nucleic acid adopts a phosphorus determination method, and the principle is that the nucleic acid molecules contain a certain proportion of organic phosphorus, the amount of the nucleic acid can be obtained by determining the content of the organic phosphorus in the nucleic acid, and the content of the organic phosphorus is the difference value of the total phosphorus content and the positive phosphorus content. The content of the normal phosphorus and the total phosphorus is measured according to the national standard GB/T6913-2008.
The procedure of the simulation was as follows:
(1) extracting a biological slime turbid liquid from a circulating water system of the coking plant, filtering and separating the biological slime turbid liquid, repeatedly cleaning and filtering the biological slime turbid liquid for 2 times by using deionized water to obtain standby slime, and mixing the standby slime with the deionized water to obtain a biological slime solution of 10 g/L;
(2) taking a plurality of beakers, adding 1L of biological slime solution into each beaker, respectively adding the biological dispersants of the first embodiment and the comparative example, stirring for 10min at a constant temperature of 28 ℃ and a rotating speed of 30r/min, then sequentially adding a bactericide (the addition amount is 80ppm) and a scale and corrosion inhibitor (the addition amount is 80ppm) in a stirring state, continuously stirring, and keeping for 24h to obtain a mixed solution;
(3) sampling, filtering and measuring the content of polysaccharide and nucleic acid in the filtrate.
The results of the measurements on each filtrate after treatment with the agent are shown in the following table:
as can be seen from the results in the table above, the content of polysaccharide and nucleic acid in examples 2.1-2.6 is higher than that in examples 2.7-2.10, and the results in comparative examples 2.9 and 2.10 show that the biological dispersant in comparative example 1.3 has association reaction with the scale and corrosion inhibitor, so that the biological slime removing effect of the biological dispersant in comparative example 1.3 is reduced. The biological dispersant has excellent penetrating and dispersing functions, and obviously enhances the penetrating capacity to organic matters and the dispersing capacity to inorganic dirt and organic matter precipitates.
EXAMPLE III
The embodiment relates to the evaluation of the application effect of the biological dispersant in an industrial circulating cooling water system.
The bio-dispersant of example 1.6 was tested for field application and compared to the field application effect of the bio-dispersant commonly used in the art, i.e., comparative example 1.3.
The performance of the agent was evaluated using the exopolymer method and the method of measuring the amount of biological slime. The determination of the polysaccharide and nucleic acid content was performed in the same manner as in the experimental procedure of example two. The biological slime amount is measured according to the national standard GB/T14643.1-2009 of the industrial circulating cooling water quality analysis method.
The field application test conditions are as follows: the circulation volume of the circulating water system is 6500m3Per, system volume 3000m3Concentration multiple 2.5 +/-0.2, flow rate 1.0m/s, inlet temperature 36 +/-2 ℃ and temperature difference 8 ℃.
The water quality of the supplemented water is shown in the following table:
the field application test results are as follows:
as can be seen from the results in the table above, compared with the existing biological dispersant, the biological slime removing effect of the biological dispersant of the invention is obviously improved in the field application of an industrial circulating cooling water system.
The biological dispersant of example 1.6 is added into a circulating cooling water system, the addition amount is 20ppm, the addition amount of a bactericide is 60ppm, the addition amount of a scale and corrosion inhibitor is 80ppm, after treatment for one week, no green or black slime exists on the wall of a cooling tower, the water quality of the circulating water system is normal, no corrosion or scaling phenomenon exists, and the heat exchange efficiency of each heat exchanger of the system is good.
The dispersant adopted in the circulating cooling water system is comparative example 1.3, the addition amount of the dispersant is 100ppm, the addition amount of the bactericide is 100ppm, the addition amount of the scale and corrosion inhibitor is 100ppm, a small amount of slime or even a small amount of grey soft scale is still attached to the wall of the cooling tower after treatment for one week, and the heat exchange efficiency of the heat exchanger is low. Because the biological dispersant contains a large amount of ionic surfactant components, the effective components of the biological dispersant and the scale and corrosion inhibitor are subjected to association reaction, so that the treatment effects of the biological dispersant and the scale and corrosion inhibitor are reduced.
Therefore, the biological dispersant can obviously improve the slime stripping effect of the bactericide under low usage amount, quickly treat biological slime pollution, reduce the usage amount of the bactericide, help the treatment effect of the scale and corrosion inhibitor and reduce the cost.
In conclusion, the biological dispersant for circulating cooling water has the advantages of obviously enhancing the penetrating capacity to organic matters and the dispersing capacity to inorganic dirt and organic matter precipitates, improving the penetrability of the bactericide to biological slime, improving the sterilization effect and further optimizing the effect of removing microorganisms and biological slime from the surface of the pipe wall. The biological dispersant has mutual miscibility and solubility with other water treatment agents such as scale and corrosion inhibitors used in circulating cooling water, and can also help the other water treatment agents to play roles. In addition, the biological dispersant belongs to an environment-friendly water treatment agent and can be well biodegraded.
Claims (10)
1. The biological dispersant for circulating cooling water is characterized by comprising the following raw material components in parts by weight: 30-60 parts of sodium styrene sulfonate-acryloyl morpholine polymer and/or allyl alcohol-acryloyl morpholine polymer, 10-30 parts of polyaspartic acid and 1-10 parts of polyoxyethylene ether surfactant.
2. The bio-dispersant for circulating cooling water according to claim 1, characterized in that: the polyoxyethylene ether surfactant comprises at least one of n-octanol polyoxyethylene ether, isooctanol polyoxyethylene ether or fatty acid methyl ester polyoxyethylene ether.
3. The bio-dispersant for circulating cooling water according to claim 1, characterized in that: the molecular weight of the polyaspartic acid is 3000-5000.
4. The biological dispersant for circulating cooling water according to any one of claims 1 to 3, characterized by comprising the following raw material components in parts by weight: 40-60 parts of a mixture of styrene sodium sulfonate-acryloyl morpholine polymer and allyl alcohol-acryloyl morpholine polymer according to the weight ratio of 7:3, 20-30 parts of polyaspartic acid with the molecular weight of 3000-5000 and 3-8 parts of a mixture of n-octanol polyoxyethylene ether and isooctanol polyoxyethylene ether according to the weight ratio of 1: 1.
5. The biological dispersant for circulating cooling water according to claim 1, further comprising the following raw material components in parts by weight: 1-10 parts of acrylic acid-2-methyl-2-acrylamide propyl sulfonic acid copolymer.
6. The biological dispersant for circulating cooling water according to claim 1, further comprising the following raw material components in parts by weight: 1-10 parts of sodium dodecyl sulfate.
7. A method for preparing the bio-dispersant for circulating cooling water according to any one of claims 1 to 4, comprising the steps of:
a. adding polyoxyethylene ether surfactant into polyaspartic acid under stirring, and stirring at room temperature for 30-60min to obtain solution A;
b. adding deionized water into the sodium styrene sulfonate-acryloyl morpholine polymer and/or the allyl alcohol-acryloyl morpholine polymer, stirring for 30-60min at room temperature, adjusting the pH value to 9.0 +/-0.5, and stirring uniformly to obtain a solution B;
c. and taking the solution A, adding the solution B under the stirring state, adjusting the pH value to 12 +/-0.5, and stirring at room temperature for 1-2h to obtain the biological dispersant for the circulating cooling water.
8. The method for preparing the bio-dispersant for circulating cooling water according to claim 7, wherein: the stirring speed in the steps a-c is 30-60 r/min.
9. The method for preparing the bio-dispersant for circulating cooling water according to claim 7, wherein: and b, adding deionized water into the sodium styrene sulfonate-acryloyl morpholine polymer and/or the allyl alcohol-acryloyl morpholine polymer, uniformly stirring, adding acrylic acid-2-methyl-2-acrylamide propanesulfonic acid copolymer and/or sodium dodecyl sulfate, stirring at room temperature, and adjusting the pH value.
10. The method for preparing bio-dispersant for circulating cooling water according to claim 7, wherein said polyaspartic acid is prepared by the following steps:
(1) synthesis of polysuccinimide: carrying out thermal condensation polymerization reaction on raw material L-aspartic acid under the action of catalyst phosphoric acid to prepare polysuccinimide; the reaction temperature is 180-200 ℃, and the reaction time is 1-2 h;
(2) hydrolyzed polysuccinimide: adding water into a reaction kettle, starting stirring, adding polysuccinimide, slowly adding a sodium hydroxide solution, heating for hydrolysis reaction to obtain a polyaspartic acid solution; the hydrolysis temperature is 65 ℃, and the hydrolysis reaction time is 0.5-1 h;
(3) adjusting the pH value: adjusting the pH value of the polyaspartic acid solution to 9.0-10.0 to obtain polyaspartic acid with the molecular weight of 3000-5000.
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| GB1072045A (en) * | 1962-11-15 | 1967-06-14 | Rohm & Haas | Coating compositions |
| CN102464377A (en) * | 2010-11-15 | 2012-05-23 | 中国石油化工股份有限公司 | Method suitable for control of biological slime of circulating cooling water |
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